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JOURNAL OF PLANKTON RESEARCH | VOLUME 12 | NUMBER 4 | PAGES 717-734 | 1990
© Oxford University Press

research-article

Estimates of ‘new production’ in the Mid-North Atlantic1

C.S. Yentsch

Bigelow Laboratory for Ocean Sciences West Boothbay Harbor, MN 04575, USA

Received on December 30, 1989; accepted on March 22, 1990

The principal aim of this paper is to demonstrate how the major features of primary production are influenced by climatological change. The roles played by seasonal change in mixed layer depth and the vertical distribution of a key limiting nutrient are emphasized. The model traces the sequences of primary production as the sun moves from the winter to summer solstice. Seasonal change in primary production is regulated by light at high latitudes during winter months and nutrients during summer months, where at mid and low latitudes nutrients limit production. The annual pattern of production down the central meridian reflects the vertical distribution of nitrate-nitrogen in cross-sections of the mid-ocean. In turn, this pattern of nutrient distribution reflects the density structure due to the currents and gyres of the North Atlantic. The model produces estimates of ‘new primary production’ which are consistent when compared with measured values. It should be useful for global estimates of primary production.

1‘Production’ refers to primary carbon fixation where nitrate is the only nitrogen source


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